ArcheAge: Underwater Farm and the Marine Products

In CBT4, ArcheAge updated the underwater farm, now let's see how it works.

First please find Building Merchant, buy a blueprint of farm, its price is 30 gold, although it's a little expensive, you can own an aquafarm, it's worthful.
Then find Nursery Trader and buy coral, pearl etc. from him. After incubating, coral and pearl can be the materials of making necklace.
Seedling Merchant sell seaweed, spores etc. Seaweed is one of the cooking materials.
Now you can go to the sea and select a place to build your farm.
This place named Surfy Rocky Island where is near marine residence. But if you wanna go there, you maybe will be lack of oxygen, there are several ways solving this problem. One is buying the Diving Helmet, another is using oxygen cylinder in ship, you also can use the 'air bubble' which can be produced by yourfarm after building.

If you have a ship, you can use the oxygen cylinder to finish diving operations.
After making a ship, there are six oxygen cylinders set, they will be full of oxygen in five minutes after summoning the ship. You can breathe underwater indefinitely with the oxygen cylinder. But oxygen cylinders set will disappear automatically after a period of time.

Or after building farm, you can press F button to confirm your status, then you can press G button to use the air in aquafarm. So you don't need to surface for air.
And if you want to breed seafood in your farm, you need to build your house around farm in marine residence, then you can set scarecrow and start to breed Seaweed and Spores, if you breed more seaweed, you can obtain more materials. The items has little chance to be stole by others, but because there are many players planting these items too, please remember your planting location.